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melonDS
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bad attempt at implementing this

This commit is contained in:
RSDuck 2022-10-25 01:57:45 +02:00
parent b6776bd826
commit 39da2b5ab6
1 changed files with 17 additions and 3 deletions
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20
src/GPU3D.cpp
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@ -19,6 +19,7 @@
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <math.h>
#include "NDS.h"
#include "GPU.h"
#include "FIFO.h"
@ -1554,9 +1555,22 @@ void CalculateLighting()
if (difflevel < 0) difflevel = 0;
else if (difflevel > 255) difflevel = 255;
s32 shinelevel = -(((LightDirection[i][0]>>1)*normaltrans[0] +
(LightDirection[i][1]>>1)*normaltrans[1] +
((LightDirection[i][2]-0x200)>>1)*normaltrans[2]) >> 10);
s32 halfVec[3];
halfVec[0] = LightDirection[i][0] >> 1;
halfVec[1] = LightDirection[i][1] >> 1;
halfVec[2] = ((s32)LightDirection[i][2] - 0x200) >> 1;
s32 halfVecLen = (s32)(sqrtf((halfVec[0]*halfVec[0]+halfVec[1]*halfVec[1]+halfVec[2]*halfVec[2])/(512.f*512.f)) * 512.f);
//printf("vec len %d\n", halfVecLen);
if (halfVecLen > 0)
{
halfVec[0] = (halfVec[0]<<9) / halfVecLen;
halfVec[1] = (halfVec[1]<<9) / halfVecLen;
halfVec[2] = (halfVec[2]<<9) / halfVecLen;
}
s32 shinelevel = -((halfVec[0]*normaltrans[0] +
halfVec[1]*normaltrans[1] +
halfVec[2]*normaltrans[2]) >> 10);
if (shinelevel < 0) shinelevel = 0;
else if (shinelevel > 255) shinelevel = (0x100 - shinelevel) & 0xFF;
shinelevel = ((shinelevel * shinelevel) >> 7) - 0x100; // really (2*shinelevel*shinelevel)-1